6 PERFORMANCE DIAGNOSTICS 207
Test Procedures
1. Diagnostic Trouble Codes
Figure 262
Purpose
• To determine if the ECM has detected Diagnostic
Trouble Codes (DTCs) indicating conditions that
could cause engine problems
•Tofill out Diagnostic Form heading
• To check for abnormal sensor readings
Tools
• EST with MasterDiagnostics® software
• EZ-Tech® interface cable
Vehicle Information for Form Heading
Figure 263
NOTE: Before continuing diagnostic tests, fill out the
form heading on Diagnostics Form EGED-290.
Entering Ve hicle Information without using the
EST
1. Enter the following information in the form
heading:
• Technician
• Date (for warranty)
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
©August 2008 Navistar, Inc.
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